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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_HISTORY_VISIT_TRACKER_H__
#define CHROME_BROWSER_HISTORY_VISIT_TRACKER_H__
#include <list>
#include <map>
#include "base/basictypes.h"
#include "base/time.h"
#include "chrome/browser/history/history_types.h"
namespace history {
// Tracks history transitions between pages. The history backend uses this to
// link up page transitions to form a chain of page visits, and to set the
// transition type properly.
//
// This class is not thread safe.
class VisitTracker {
public:
VisitTracker();
~VisitTracker();
// Notifications -------------------------------------------------------------
void AddVisit(const void* host,
int32 page_id,
const GURL& url,
VisitID visit_id);
// When a RenderProcessHost is destroyed, we want to clear out our saved
// transitions/visit IDs for it.
void NotifyRenderProcessHostDestruction(const void* host);
// Querying ------------------------------------------------------------------
// Returns the visit ID for the transition given information about the visit
// supplied by the renderer. We will return 0 if there is no appropriate
// referring visit.
VisitID GetLastVisit(const void* host, int32 page_id, const GURL& url);
private:
struct Transition {
GURL url; // URL that the event happened to.
int32 page_id; // ID generated by the render process host.
VisitID visit_id; // Visit ID generated by history.
};
typedef std::vector<Transition> TransitionList;
typedef std::map<const void*, TransitionList*> HostList;
// Expires oldish items in the given transition list. This keeps the list
// size small by removing items that are unlikely to be needed, which is
// important for GetReferrer which does brute-force searches of this list.
void CleanupTransitionList(TransitionList* transitions);
// Maps render view hosts to lists of recent transitions.
HostList hosts_;
DISALLOW_EVIL_CONSTRUCTORS(VisitTracker);
};
} // namespace history
#endif // CHROME_BROWSER_HISTORY_VISIT_TRACKER_H__
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